Drier.



A. W. LISSAUER.

DRIER.

APPLICATION flLED DEc.24,19xr.

indented Sept. 3,1918.

2 SHEETS-SHEET l IN1/Enron HKZ/35M@- 8' m/ a A Tron/'v5 rs `menen w. LIssAUEn, or New Yoan, N. Y.

Damit.

Specilcation of Letters Patent.

Patented sept. 3, 191s.

Application led 'December 24, 1917. Serial No. 208,648.

` To all whom it may concern:

Be it known that I, ADoLrH W. Lissamin, a. citizen of the United States, and a resident 'of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Drier, of which the following is a full, clear and exact description.

My invention relates to driers and an object thereof is to provide a simple and eiiicient drier whereby the material placed therein can be dried thoroughly and expeditiously without supplying heat directly to the drier.

Another object of the invention is to provide a drier in which the air coming from the drier can be mixed with the atmospheric air and sent again through the drier,'thereby v obtaining a better eiiiciency'in the drying in utilizing the moisture present in the air which came from the drier.. n o

With the above and other objects in view, the nature of which will more fully appear as the description `proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part ofthe application, similar characters of reference indicate corresponding parts in all the views.-

Figure 1 isa plan View of a drier em-'l bodying my invention; s Fig. 2 is a section on line 2-2, Fig. 4. Fig. 3 is an end elevation with the damper control in section;

Fig. 4 is a cross section through the drier;

and Fig is a section on line 5-5, Fig. 4. Referring to the drawings, 6 is a housing which has longitudinal partitions 7 dividing said housing lon itudinally into two equal sections 8 spaced y a narrower central longitudinal section 9. To increase the eiciency of the device and reduce its cost, the housing 6 is built high enough so that the same can be subdivided into an upper and a lower half by .a partition 10 extending through its entire length and width whereby the housing sections 8 and the sections 9 are subdivided into upper and lower halves which are identical in every respect, as will appear hereinafter. Each half of the housing section 8 is subdivided by vertical partiltions 11 into chambers 1 2.

Each of the chambers has a top opening damper 25.

13 and a bottom opening 14 establishingy communication with the adjacent half of section 9. Each of the halves of section 9 is subdivided by a partition 15, disposed obliquely into passages, the upper passage 16 preferably forming` an inlet and the lower i passage 17, an outlet. In consequence, the

, upper openings 13 form 'the inlet openings into the chambers and the lower openings 14 form the outlet openings from the chambers. Thev reason for placing the partitions 15 obliquely is to provide suliicient volume to convey air to and from the successive chambers.

The upper passages 16 at their wider end are in communication with the exhaust -18 of a fan 19 whereby air is supplied tosaid chambers. The air entering into each of the chambers 12 is caused to travel along deflectors or baflies 20, 'preferably disposed horizontally in each of the chambers between the successive rails 21-on which the removable trays for material to be dried areplaced. The trays are accessible through end doors 22 leading to each of the chambers independently.

The air circulated in each of the chambers, as indicated by the arrows, reaches the -outlet vopening l14 wherefrom it enters the 24 of the fan. The flow from the conduit l2% to the inlet end of the fan and to the atmosphcre, and' from the atmosphere to the inlet end of the fan 24, is controlled by a Between the damper and the fan ,a heater 24 is provided to preheat the air drawn by the fan through the cross. By manipulating the damper 25 the quantity of air .coming from the drier and that of the atmosphere 4may be' mixed inl any desired quantity and thereby the -eiiiciency of the drier varied according to the material to be dried. In other words, if desired, only a small quantity of fresh'air may be added to the air takenfrom the'drier. If desired, the air from the drier can be exhausted directly into the atmosphere and fresh'air circulated therein; but experience has shown that the eiciency of the drier is considerably venhanced if a large part of the air coming from the drier, after circulating over the material to be dried, is mixed with fresh air, due to the reason that the moisture resent in the air coming from the drier facilitates the drying of the material and prevents the formation of a crust on the surface of the material to be dried, which crust prevents the penetration of the drying air into the body of the material. It may be further remarked that it is a well known fact that moist air is a better drying agent than Idr air. It must be understood that when re erence is made to atmospheric or fresh air it does not necessarily mean the air directly from the atmosphere, for the air taken by the fan may be caused to pass through a humidifier.

It will be noted that in my arrangement the drying chambers are connected in parallel. The reason for it is that not only is less resistance offered to the fan, but a greater efficiency is obtained with the chambers in such an arrangement, as a suflicient amount of air is delivered to each of the chambers to travel over the substance to be dried without rendering the same inert or ineiiective before it reaches the outlet of the chamber.

In cases where the chambers are connected in series the resistance to flow is considerable and the efficiency of the air is considerably decreased due to the length of the path of travel. It therefore becomes necessary to interpose heating devices from the air on its way through the chambers to restore to it the capacity of further drying as it travels along the material in the chambers connected in series.

While I have described the principle of operation, together with the device which I now consider' to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made as are within the scope of the appended claims.

l. In combination, a drier having inlet and outlet air passages oit' varying cross-sectionalarea, chambers in said d rier each having an inlet and an outlet opening to the `corresponding passages, a fan adapted to deliver air to the inlet air passages at the1r maximum cross-sectional area, an outlet conduit from the maximum cross-sectional area to the outlet passages and leading to the fan, and means interposed between the inlet of the fan and the outlet conduit for controlling the mixture to be taken by the fan and delivered to the Chambers.

2. In combination, a drier having inlet and outlet air passages of varying cross-sectional area, chambers in said drier each havin an inlet and outlet opening to the corresponc ing passages, a fan adapted to supply air to the y inlet air passages at their maximum crosssectional area, an outlet conduit from the maximum cross-sectional area to the outlet passages and leading to the fan, means interposed between the inlet of the fan and the f outlet conduit for controlling the mixture to be taken by the fan and delivered to the chambers, and a heater for preheating the air before the same enters the fan.

3. In a drier, a drying chamber having an inlet and an outlet opening on the same side, bafiles extending from the side of the wall in which the inlet and outlet are formed, and baffles extending from the opposite side between the batlles rst mentioned.

ADOLPH W. LISSAUER. 

